PDF malware analysis — malicious · 5ae40c937389af67

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 07:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f5ad6c78a4fc535fefafc5f09a4364d9 SHA-1: c6f6347cff55e500d5d9e1e81e1daf41b3a3ba3c SHA-256: 5ae40c937389af6701bae7f4388ac12d20069a8620f1f0464f5b2ca4b884e5d1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, many of which are hosted on WordPress installations using the 'formcraft' plugin. These links are designed to appear as download locations for a mobile game, but the ML classifier and ClamAV detection indicate malicious intent. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613873c1dbc7d---22271163423.pdf In PDF document text
- https://bunian-co.com/other_files/File/75548381043.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334eeb97df8---75161081057.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e8220da48d03899d0023f04419d74378/87815723751.pdfIn PDF document text
- https://perfecthospital.org/ckfinder/userfiles/files/85241663198.pdfIn PDF document text
- https://nhahangthanghuong.com/uploads/files/piluraregaki.pdfIn PDF document text
- https://giolog.biz/images/bulk_images/files/sapopawopanisowidezomakut.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161393b72f2795---35421084567.pdfIn PDF document text
- https://ijtm.in/userfiles/file/68906143991.pdfIn PDF document text
- https://giga-tronics.com/userfiles/files/24353689987.pdfIn PDF document text
- http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93655708659.pdfIn PDF document text
- http://sten.kr/club/data/userfiles/file/20210902012738.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0bdkgoice2g7njf8678569q6d7/84884384725.pdfIn PDF document text
- https://happyjourney.webtrails.in/ckfinder/userfiles/files/suwodefanubizozugimulanur.pdfIn PDF document text
- https://lanegarrett.net/userfiles/file/zejefivopa.pdfIn PDF document text
- http://geometramaurotozzi.it/userfiles/files/zabopevijuxerosuga.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+mlbb+for+iosPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d587.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD587	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ed9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED9E	10512 bytes
SHA-256: `ae6e58f0be00879072c561a56a591ccfedba3474cc822237cda96054f9c6bcab`
`font_02_sfnt_off0001057a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1057A	17376 bytes
SHA-256: `4cd56aefae4be9c51e42bff3709ee6447580ee7de88427683c90146ca9e20d08`

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